ANS is committed to advancing, fostering, and promoting the development and application of nuclear sciences and technologies to benefit society.
Explore the many uses for nuclear science and its impact on energy, the environment, healthcare, food, and more.
Division Spotlight
Aerospace Nuclear Science & Technology
Organized to promote the advancement of knowledge in the use of nuclear science and technologies in the aerospace application. Specialized nuclear-based technologies and applications are needed to advance the state-of-the-art in aerospace design, engineering and operations to explore planetary bodies in our solar system and beyond, plus enhance the safety of air travel, especially high speed air travel. Areas of interest will include but are not limited to the creation of nuclear-based power and propulsion systems, multifunctional materials to protect humans and electronic components from atmospheric, space, and nuclear power system radiation, human factor strategies for the safety and reliable operation of nuclear power and propulsion plants by non-specialized personnel and more.
Meeting Spotlight
ANS Student Conference 2025
April 3–5, 2025
Albuquerque, NM|The University of New Mexico
Standards Program
The Standards Committee is responsible for the development and maintenance of voluntary consensus standards that address the design, analysis, and operation of components, systems, and facilities related to the application of nuclear science and technology. Find out What’s New, check out the Standards Store, or Get Involved today!
Latest Magazine Issues
Apr 2025
Jan 2025
Latest Journal Issues
Nuclear Science and Engineering
May 2025
Nuclear Technology
April 2025
Fusion Science and Technology
Latest News
General Kenneth Nichols and the Manhattan Project
Nichols
The Oak Ridger has published the latest in a series of articles about General Kenneth D. Nichols, the Manhattan Project, and the 1954 Atomic Energy Act. The series has been produced by Nichols’ grandniece Barbara Rogers Scollin and Oak Ridge (Tenn.) city historian David Ray Smith. Gen. Nichols (1907–2000) was the district engineer for the Manhattan Engineer District during the Manhattan Project.
As Smith and Scollin explain, Nichols “had supervision of the research and development connected with, and the design, construction, and operation of, all plants required to produce plutonium-239 and uranium-235, including the construction of the towns of Oak Ridge, Tennessee, and Richland, Washington. The responsibility of his position was massive as he oversaw a workforce of both military and civilian personnel of approximately 125,000; his Oak Ridge office became the center of the wartime atomic energy’s activities.”
Kristina Skagius, Gunnar Svedberg, Ivars Neretnieks
Nuclear Technology | Volume 59 | Number 2 | November 1982 | Pages 302-313
Technical Paper | Radioactive Waste Management | doi.org/10.13182/NT82-A33033
Articles are hosted by Taylor and Francis Online.
A significant retardation of radionuclides leaking from an underground repository can be expected if large parts of the rock body act as a sink for the radionuclides. To calculate the retardation, it is necessary to know the sorption properties and the diffusivities in the rock matrix for the radionuclides in the rock. The diffusivity will determine to what extent the rock matrix may be penetrated. Sorption experiments have been performed to determine the diffusion and sorption properties of cesium and strontium in crushed granite particles with one granite from Finnsjoen outside Forsmark on the east coast of Sweden, and one granite from the Stripa mine in central Sweden. Granite samples have been crushed and screened, and six different particle size fractions from 0.10 to 0.12 mm and 4 to 5 mm of each rock have been used in the experiments. The initial concentrations of inactive cesium and strontium were 10 to 15 ppm. A “synthetic” groundwater was used. The adsorption isotherm was found to be linear for strontium but nonlinear for cesium. One conclusion from this is that a prediction of cesium migration velocity from one single distribution coefficient is inappropriate. The experimental data indicate that the amount of sorption is dependent not only on the mass of granite particles but also to some extent on the size of the particles. A distinction has been made between sorption on external surfaces and inner surfaces. The amount of external surface adsorption was found to vary from 15 to 40% of the total adsorption capacity for the particle size fraction of 0.10 to 0.12 mm to a few percent or less for the largest particles used. Except for the largest particles, the experimentally determined diffusivities were found to lie in the interval expected from literature data on electric conductivities. The diffusivities were found to increase with increasing particle size. This could be explained by a higher diffusion rate in grain boundaries than in a homogeneous material. Nearly all of the smallest particles consist of only one mineral each.
